JPH11319635A - Device for and method of coating organic material to contact point - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely apply the desired quantity of an organic material on the surface of a contact point by ejecting the organic material through plural through-holes having the inside diameter equal to or below a specific value to coat the surface of the contact point with the organic material. SOLUTION: Jetting parts 10 formed by perforating nozzle holes 9 having <=50 μm diameter respectively in about 10 lines 2 rows are arranged at 3 places in parallel on the under surface of an ejecting head part 8. The organic material diluted by isoprophyl alcohol or the like, e.g. CRC (a contact point lubricant agent prepared by dissolving a mineral oil, a fatty acid ester, a petroleum sulfonate, a metallic soap or the like in a petroleum based solvent, a halogenated hydrocarbon or the like) or a non-volatile contact point lubricant (e.g. a contact point lubricant prepared by dissolving a non-volatile >=2 polyhydric alcohol in a non-volatile univalent alcohol, ether) is ejected to the surface of the contact point from each nozzle 9. The dropping quantity is controlled to equal to below several nl (10<-10> l) per one time of the jetting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact organic material applying apparatus and a contact organic material applying method for applying an organic material to the surface of a contact such as a relay.

[0002]

2. Description of the Related Art Conventionally, an organic substance is applied to the surface of a contact used for a relay or the like by using a microdispenser or a brush for the purpose of stabilizing a contact resistance value (for example, see Japanese Unexamined Patent Publication No. JP-A-162673, JP-A-7-76
694).

[0003]

However, in the above-described microdispenser, there is an error in the amount of the organic substance dropped from the tip nozzle on the order of microns liter (10 ^-6 l). Further, it is inevitable that application unevenness occurs with a brush. For this reason, the applied amount of the organic substance on the contact surface varies, and if the applied amount is small, the purpose of stabilizing the contact resistance value is not achieved.If the applied amount is large, the carbon generated on the contact surface when opening and closing the contact is increased. There is a problem in that the amount is too large, resulting in defective insulation or adhesion to other parts. In particular, in the case of a brush, there is a problem that the contact surface is contaminated due to direct contact with the contact, and a stable contact resistance value cannot be obtained.

Accordingly, an object of the present invention is to provide an organic material applying apparatus for a contact which can accurately apply a desired amount of an organic material to the surface of the contact.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, an organic substance application device for a contact is sprayed with an organic substance through a plurality of through-holes having an inner diameter of 50 μm or less. This is a configuration having a coating means for coating an organic substance on the surface.

[0006] It is preferable that the application means is configured to apply the organic substance in a plurality of times by setting the amount of the organic substance to be injected at once to several nl or less.

Further, the through-hole of the coating means is provided with a coating amount,
It is preferable to form the film so that it can be jetted only to a desired portion corresponding to a difference in application conditions such as an application position.

Further, the present invention provides a method for applying an organic material for a contact, which has an inner diameter of 50 μm.
An organic substance is injected through a plurality of through holes as described below, and the amount of one injection is set to several nl or less, so that application is performed in a plurality of times.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an outline of an organic material applying apparatus for a contact according to the present embodiment. The organic material application device for a contact generally includes a contact point transport section 1 and an organic substance application section 2.

The contact conveying section 1 is for conveying the strip-shaped conductive plate 4 provided with the contacts 3 at a predetermined pitch in the longitudinal direction, and is composed of a pair of upper and lower blocks, and the air is blown onto the conductive plate 4 to make it float. It consists of an air feeder. Tongues 5 which are movable contact pieces by being cut out in a substantially U-shape are arranged in parallel on the conductive plate 4, and the contacts 3 are provided at free ends of the tongues 5. Note that various materials such as an Ag alloy, an Au alloy, a Pt alloy, and a Pd alloy can be used for the contact 3. A plurality of through holes 6 are formed at predetermined intervals along both side edges of the conductive plate 4.
Positioning can be performed by engaging four pins 7 provided on the contact point transport unit 1 with the pins 7.

The organic material application section 2 includes a jet head section 8,
A drive unit (not shown) for driving the ejection head unit 8 in the XY direction in the same horizontal plane is constituted. As shown in FIG. 2, on the lower surface of the jet head 8,
Injecting parts 10 each formed by piercing nozzle holes 9 having a diameter of about 40 μm in 10 rows and 2 columns are arranged in three places (the pitch of each nozzle hole 9 is about 300 μm). From each nozzle hole 9, an organic substance diluted with isopropyl alcohol or the like, for example, CRC (contact lubricant in which mineral oil, fatty acid ester, petroleum sulfonate, metal soap, etc. is dissolved in petroleum solvent, halogenated hydrocarbon, etc.) or non-volatile Contact lubricant (for example, a contact lubricant in which non-volatile dihydric or higher alcohols are dissolved in non-volatile monohydric alcohols / ethers) and the like are sprayed, and the amount of drop is per injection. With a few nl (nanoliter: 10 ^-10 l), the drop frequency is at least 1 to 20 kHz. The driving of the driving unit is controlled by a signal from the control unit 11, so that the ejection head unit 8 can be moved to a desired position. The position and number of the nozzle holes 9 are not limited to those described above, and may be determined according to the size and shape of the contact 3.

Next, the operation of the contact organic material coating apparatus will be described.

First, the air feeder is driven to move the conductive plate 4 by a predetermined pitch. Then, the pins 7 are raised and engaged with the through holes 6 of the conductive plate 4 to position the conductive plate 4. Subsequently, the ejection head unit 8 is moved and the contact 3
Then, an organic substance is sprayed. The organic matter is ejected from the nozzle hole 9 having a diameter of about 40 μm in units of several nl per one ejection. For this reason, the film thickness formed on the surface of the contact 3 can be gradually increased at a constant rate, and a film having a desired thickness can be reliably obtained. In addition, since the organic substance can be dropped at a frequency of at least 1 to 20 kHz, a film having a desired thickness can be formed in a short time.

The organic material can be applied in various patterns. For example, by setting the pitch of each nozzle hole 9 small, as shown in FIG.
When the organic matter is densely distributed on the surface of the contact 3, FIG.
As shown in (1), there is little variation in the film thickness. Conversely, by setting the pitch of each nozzle hole 9 large, as shown in FIG. 4 (a), the organic matter is sparsely distributed on the contact surface, and then left for a certain period of time until the organic matter reaches the range shown by the dotted line. By widening, it is possible to make the film thickness thinner than in the case of FIG. In this case, by spraying the organic substance a plurality of times and shifting the position of the nozzle hole 9 (for example, rotating), a uniform coating can be formed. Further, by localizing the nozzle holes 9, a coating is formed only at the center of the contact surface as shown in FIG. 5, or along the central projection of the substantially trapezoidal contact surface as shown in FIG. The coating may be formed only at the position. Also in this case, for the same reason as described above, the organic substance may be sprayed a plurality of times, and the position of the nozzle hole 9 may be shifted (for example, sliding movement). In any of the patterns shown in FIGS. 3 to 6, the selection of the nozzle hole 9 for ejecting the organic matter and the ejection amount, and the movement of the ejection head portion 8 in the horizontal plane are also performed by the program processing. It is possible to apply easily by controlling automatically.

As described above, when the jet head 8 is used, it is possible to easily change the application amount and the application position. Therefore, the application conditions can be changed according to various contacts 3 having different shapes and materials used for relays and switches.

[0017]

As is apparent from the above description, the following effects can be obtained by the contact organic material applying apparatus and the contact organic material applying method according to the present invention.

That is, the organic material is applied to the surface of the contact by spraying the organic material through a plurality of through holes having an inner diameter of 50 μm or less, so that the organic material is applied to a uniform and desired thickness without contaminating the surface of the contact. And the contact resistance can be stabilized.

In particular, by setting the spray amount of the organic substance at one time to several nl or less, the application can be performed in a plurality of times, so that the organic substance film having a desired thickness can be easily formed on the contact surface.

Further, the through-hole of the coating means is provided with a coating amount,
Since it is formed such that it can be sprayed only at a desired location corresponding to a difference in application conditions such as an application position, a minimum necessary organic substance can be appropriately applied, and a flexible response is possible.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an organic material application device for a contact according to an embodiment.

FIG. 2 is a perspective view showing a state of the ejection head of FIG. 1 as viewed from a bottom surface side.

FIGS. 3A and 3B are a plan view and a side view of a contact showing a state where an organic material is applied by different methods. FIGS.

4A and 4B are a plan view and a side view of a contact showing a state where an organic material is applied by different methods.

5A and 5B are a plan view and a side view of a contact showing a state where an organic material is applied by different methods.

FIG. 6 is a plan view (a) and a side view (b) of a contact showing a state where an organic material is applied by a different method.

[Explanation of symbols]

 1: Contact transport section 2: Organic substance application section 3: Contact point 4: Conductive plate 5: Tongue piece 6: Through hole 7: Pin 8: Injection head section 9: Nozzle hole 10: Injection section 11: Control section

Claims (4)

[Claims] 1. An organic substance applying apparatus for a contact, comprising: applying means for applying an organic substance to a surface of a contact by spraying the organic substance through a plurality of through holes having an inner diameter of 50 μm or less. 2. The organic material applying apparatus for a contact according to claim 1, wherein the applying means applies the organic material in a plurality of times by setting the injection amount of the organic material at one time to several nl or less. 3. The contact according to claim 1, wherein the through-hole of the application unit is formed so as to be jettable only at a desired location according to a difference in application conditions such as an application amount and an application position. For organic matter coating equipment. 4. An organic material for a contact, wherein an organic material is sprayed through a plurality of through-holes having an inner diameter of 50 μm or less, and a single spray amount is set to several nl or less, whereby the organic material is applied in a plurality of times. Coating method.